18QHTF21-21.7725-PD

Oscillators Overview

The 18QHTF21-21.7725-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 21.7725 MHz with an LVCMOS output logic level. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Oscillators Feature Summary

• Standard crystal oscillator configuration providing stable clock signals
• LVCMOS output interface compatible with digital logic circuits
• Integrated standby mode to reduce power consumption during idle periods

Oscillators Applications

• General-purpose digital circuit timing
• Microcontroller clock sources
• Communication module synchronization

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your design specifications before procurement. Ensure the 1.8V supply rail stability meets the oscillator's operational limits. Confirm that the 4-SMD no-lead package footprint aligns with your PCB layout constraints to ensure proper assembly and thermal performance.

Oscillators Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standard LVCMOS interface. The inclusion of a power-down feature makes it suitable for battery-operated devices where standby current reduction is critical. Ensure the application does not require spread-spectrum capabilities, as this model is specified as a standard XO without modulation features.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within a small form factor. The series is designed for portable electronics and compact systems. The suffix PD indicates the presence of a power-down control pin, distinguishing it from continuously running variants in the same package family.

Oscillators Replacement Considerations

Direct replacements must match the 21.7725 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package dimensions. Verify that any substitute also includes a power-down feature if system power management relies on this functionality.